<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>计算器</title>
</head>
<body>
        <form action="/calc">
          <h1>计算器</h1>
          数字1：<input name="num1" type="text"><br>
          数字2：<input name="num2" type="text"><br>
          <input type="submit" value=" 点击相加 ">
        </form>
</body>
</html>
